if you are in for like twenty bones, yeah, do some lock top plasticware with humidification. only downside, other than aesthetic, is total seal. as it will not breathe at all on it's own, i myself would vent it weekly (assuming you smoke less than one a week).
get a new piece to avoid any odor transfers. get some boveda packs. hell, even get some spanish cedar blocks and sheets (ask your local, they come in many boxes, and are essentially packing material, so free if you ask nice!) to help regulate the humidity, and fill volume.
this is THE most effective storage for a budget, hands down, and it WILL do right by your smokes. then, you can take your time and gradually look around for an actual humidor down the road. took me like a year and a half to two years to outgrow my first tupperdor into my first actual box.